Tab. REF  reports the state-of-the-art comparison on the YouTube-VIS 2021 val. set. Among existing methods, CrossVIS [1]} and IFC [2]} achieve overall mask AP scores of 34.2% and 36.6%, respectively. SeqFormer [3]} obtains an overall mask AP of 40.5%. Our MS-STS VIS sets a new state-of-the-art with an overall mask AP of 42.2%. Specifically, MS-STS VIS provides an absolute gain of 2.8% over SeqFormer at higher overlap threshold of AP\(_{\mathtt {75}}\) , when using the same ResNet-50 backbone.
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